feat(images): Add small snippet about the inferRemoteSize function

[Princesseuh]

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Documentation for withastro/astro#11098

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[sarah11918]

Looking good @Princesseuh ! I didn't want to edit directly over top of you, but I did want to access some other parts of this file. We can still figure out the best wording, but I wanted to make sure that we thought about other areas where we might want to reference this!

[sarah11918]

NOTE TO SELF: you can also use inferSize on getImage, so take a sweep and make sure nothing implies that you can't, and that this (more advanced) use case is at least mentioned.